<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

    <form th:action="@{/wx/alipay/alipage}" method="post">
        <input th:value="${orderSn}" name="orderSn" />
        <button type="submit">去支付</button>
    </form>

</body>
</html>